Assertion: The wood is actually secondary xylem.
Reason: Secondary growth occurs in most of the monocot roots and stems.

Options

A. If both assertion and reason are true and reason is the correct explanantion of assertion
B. if both assertion and reason are true but reason is not the correct explanation of assertion.
C. if assertion is true but reason is false.
D. if both assertion and reason are false.

Explanation

### Step-by-Step Solution:

1. **Understanding the Assertion**: The assertion states that "the wood is actually secondary xylem." This is correct because in woody plants, the wood is primarily composed of secondary xylem, which is produced by the vascular cambium during secondary growth.

2. **Understanding the Reason**: The reason given is "secondary growth occurs in most of the monocot roots and stems." This statement is incorrect. Most monocots, such as grasses, do not undergo secondary growth because they lack a vascular cambium, which is necessary for the formation of secondary xylem and phloem.

3. **Explaining Secondary Growth**: Secondary growth is the increase in thickness or girth of the plant, which occurs due to the activity of the vascular cambium. In dicots and gymnosperms, the cambium produces secondary xylem (wood) towards the inside and secondary phloem towards the outside.

4. **Identifying the Correctness of the Statements**: Since the assertion is true (wood is secondary xylem) and the reason is false (monocots do not typically undergo secondary growth), we conclude that the assertion is correct but the reason is incorrect.

5. **Final Conclusion**: Therefore, the final answer is that the assertion is true, while the reason is false.